<!DOCTYPE html>
<html lang="en">

<head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <meta name="robots" content="index, all" />
    <title>CartoDB 图源</title>
    <link rel="stylesheet" href="../node_modules/ol/ol.css" type="text/css">
</head>

<body>
    <div id="map" class="map" style="width:100%;height:400px;"></div>
    <div>
        <form class="form-horizontal">
          <label>
            Show countries larger than
            <select id="country-area" class="form-control">
              <option value="0" default>0 ㎢</option>
              <option value="5000">5000 ㎢</option>
              <option value="10000">10000 ㎢</option>
              <option value="50000">50000 ㎢</option>
              <option value="100000">100000 ㎢</option>
            </select>
          </label>
        </form>
      </div>
</body>

</html>